Installation costs and savings estimates
Laura says the average home would need 10-12 solar panels to offset most of their demand, equating to a 4-5kWh (kilowatt hour) system.
The cost of installing a 5kWh solar system, without batteries, varies in New Zealand depending on which company you go with - but estimates generally sit around the $11,000 mark.
Without a battery to store any excess energy generated, the average homeowner would save “about $150 per month, maybe a little more” on their power bill - but Laura says savings vary considerably depending on the user’s daily usage habits.
The average payback period - the time for the system to pay for itself with the savings it makes - is around 7-8 years for the average home, she says.
With a battery to complement the system, the amount of money saved each month would be greater - often going into positive energy generation, where excess electricity is sold back to the New Zealand power grid.
The additional cost of the battery system would also mean a longer payback period of, typically, between 10-12 years.
About a third of Ecoefficient Solution’s customers now opt for a system which incorporates a battery, and the company is one of only a few in New Zealand with certification to supply and install Tesla Powerwalls.
Laura says premium quality solar panels have a warranty period of 25 years, and that customers can have peace of mind when their systems are installed by SEANZ-accredited installers, because the industry body imposes strict quality assurance and remediation procedures.